 But people aspire to be great. I think Horizon is all about that. Horizon, an American saga. Rated R. Under 17, not admitted without parent. Only in theaters tomorrow. Get tickets now. Never step in quicksand. That bit of advice may seem obvious, but it's not always easy to follow. In nature, quicksand is hard to spot. It looks like regular soil, but it behaves like a liquid. That's why if you stand on it, you sink. And the further into it you go, the harder it is to get out.